Lens-focusing device



Mar. 6, 1923. 1,447,173 J. D. ELMS LENS FOCUSING DEVICE 7 Filed July 25 1921 J M- 1 W mm[."

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Patented Mar. 6, 1 1923. Y l,447,l 73

UNITED-STATES PATENT OFFICE.

JOHN D. ELMS, OF WEST NEW BRIGHTON, NEW YORK, .A SS IG-NOR TO WIDESCOPE CAMERA CO., NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

LENS-FOCI TSING DEVICE.

Application filed July 23, 1921. Serial No. 486,951.

To all whom it may concern. I 7 similar parts are designated by similar Be it known that 1, JOHN D. ELMs, a citinumerals. zen of the United States, residing at West Figure 1 is a top plan view of one form New Brighton, in the county of Richmond, of my device. 5 borough of Richmond, city and State of New Figure 2 is a side view of Figure 1. York, have invented new and useful Im- Figure 3 is a back view of Figure 1. provements in Lens-Focusin Devices, of v The particular form of the device of my which the following isa full, 0 car, and exact invention, shown in the accompanying draw specification. ings, comprises the camera bed-plate 10, to 10 My invention relates to lens focusing dewhich are fixedly attached the two U-shaped vices and refers particularly to devices caguide members 11, 11, the upper and lower pable of simultaneously focusing a plurality sides of the guide members being spaced of divergent lenses. from each other for purposes described In the taking of widescope photographs, hereafter. Slidable within the spaces be- 16 in which it is desired to photograph abuttween the sides of the guide members, 11, 11, ting views upon a plurality of plates, or is a platform 12, to which is fixedly attached films, it is necessary that t e plurality of the right-angled plate 13,'and to the latter, lenses should be divergent with respect to the right-angled plate 14 is fixedly attached. each other and so positioned that their opti-. 'Fixedly attached to the upperly extended 20 cal centers are in vertical alignment with portion of the plate 13 is a lens-supporting each other. plate 15 havin apertures 16, 16 therein for It is further requisite that the optical the passage 0 light rays passing through axis of each lens be at right angles to its lenses carried by the divergent lense holders photographic plate, orfilm, and hence these 17 17. The divergent lens holders 17, 17 a 25 plates, or films, will be at divergent angles are so positioned with respect to each other with respect to each other. that the optical centers of their respective It is evident that, in.the production of lenses are in vertical alignment with each widescope pictures, as above described, it is other. essential that all of the plurality of lenses F ixedly attached to the camera base 10 are be in absolute focus upon their respective two right-angled plates 18, 18, to which are plates, or films, and that the independent attached the two upright screens 19, 19, in focusing of each lens requires a-considerable each of which is an opening, or window 20, amount of time and causes the possibility of these windows being so positioned as to allow non-uniformity of focusing, thus rendering the light rays assing through the lenses to 85 the plurality of photographs non-uniform in impinge at rig t angles upon photographic clearness and precision. plates, or films, behind the screens 19, 19.

It is to be further noted that, as the opti- A right-angled late 21 is fixedly attached cal axes of the different lenses are not in to the camera be -plate 10 and a threaded 0 parallelism with respect to each other, the bolt 22 passes through a hole in the plate 21, '40 movement of each lens, for purposes of holes in the screens 19, 19 and threads within focusing, must not be in the same plane as a threaded hole in the plate 14. The bolt 22 the remainder of the lenses. has the two fixedly attached washers 23, 23

The device of my invention overcomes all one on each side of the plate 21., of the difficulties of the individual and in- The lens holders 17, 17 are so positioned 45 dependent focusing of each of a plurality of upon the supporting plate- 15 that the optidivergent lenses and presents a means wherecal axis of each lens 1s at right angles to 1ts by all of a plurality of divergent lenses can screen 19 and is centered with respect to its be simultaneously and accurately focused opening 20, and thiis light passing through upon a purality of photographic plates, or the lenses, Wlll impinge at right angles upon 50 films. photographic plates, or films, behind, and

In the accompanying drawings, illustratparallel to, the screens 19, 19. ing one form of the device'of my Invention, If now the threaded bolt 22 be revolved,

theslidable platform 12 will be moved awa from, or towards, the screens 19, 19, and eac lens carried thereby will be moved equally with respect to its film as is the other lens with respect to its film.

It will thus be seen that the revolution of the bolt '22 will simultaneously focus both varied without goin a photographic film screen at right angles to the optical axis of each lens and having an. opening to admit light rays passing throu h its lens and means whereby the plurality of lenses can be simultaneously moved equally with respect to their respectivescreens.

I 2. -A lens focusing device, which. comprises, a slidable platform, a plurality of divergent lenses having their optical centers in vertical alignment with each other carried by said platform, a hotographic film screen at right angles to t e optical axis of each lens and having an opening to admit light rays passing through its lens and means-whereby the plurality of lenses can be simultaneously moved equally with respect to theirrespective screens' 3. A lens focusing device, which com-- prises, a camera bed-plate, a pluralit of guides'carried by the bed-plate, a plat ormslidable within the guides, a plurality of divergent lenses carried by the platform, a photographic film screen at right angles to the optical axisof'feach lens carried by the bed-plate "and having anv opening to admit light rays passing through its lens and means whereby the plurality of lenses can be simultaneously moved equally with re spect to their respective screens.

4. A lens focusing device, which comprises, a camera bed-plate, a plurality of guides carried by the bed-plate, a platform slidable within the guides, a plurality of divergent lenses having their 0 tical centers in vertical alignment with eac other carried by the latform, a photogra hie film screen at rig t angles to the optica axis of each lens carried by the bed-plate and having an opening to admit light rays passing through its lens and means whereby the plurality of lenses can be simultaneously moved equally with respect I to their respective screens.

5. A prises, a slidable platform, a plurality of divergent lenses having their optical centers in vertical alignment with each other carried by the platform, a photographic film screen at right angles to the optical axis of each lens and having an opening to admit light rays passing 3 through its lens and means whereby the optical centers of the lenses can be simultaneously moved equally with respect to their respective screens.

6. A lens 'focusing device, which comprises, a ,camera bedlate, a pluralit of' guides carried by the d-plate, a plat orm slidable' within the guides, a plurality of divergent lenses having their optical centers in vertical alignment'with each other carried by the I lflatdform, a hotographic film screen at rig t angles to t ing an opening to admit light rays assing through its lens and means where y the lens focusing device, which com- I e optical axis of.. each lens-carried bythe bed'plate and hav-- optical centers of the lenses can besimul- 1 taneously moved equally with respect to their respective screens.

Signed at .New York city in the county t New Yorknnd State of New York this 1st day of. July, 1921. JOHNI). ELMS. 

